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A cycle is proposed as a development of the Lenoir cycle, in which the working fluid is expanded isentropically from its peak pressure down to a point where its temperature is equal to T1, the initial temperature. The gas is then compressed isothermally back to the initial pressure. Prove that the thermal efficiency of the cycle is given by
where T2 is the maximum temperature achieved in the cycle.
Calculate the thermal efficiency of the cycle if the initial pressure is 10 bar and the maximum pressure is 35 bar. Compare this to the Carnot efficiency achievable between the temperature limits and explain why this cycle would not be used in practice.[49.9%; 71.4%]
A work piece is being cut at 76m/min (250 fpm), and the power is found to be 2.0 kW (2.7hp). The feed is .25 mm/rev (.010 in/rev) and the depth of cut is 5.0 mm (.200 in) What
A car weighing 3000 lb, traveling at 60 mph, decelerates at 0.70g after the brakes are applied. Determine the force applied to slow the car. How far does the car travel in s
Explore the effect of variations in Dd and h on q', as well as on relative contributions of convection and radiation to the net heat transfer rate. Represent your results gr
A 4-ft-long, 1-in.-diameter shaft rotates inside an equally long cylinder that is 1.02 in. in diameter. Calculate the torque required to rotate the inner shaft at 2000 rpm i
Consider a low-speed open-circuit wind tunnel operating at sea level with a nozzle contraction ratio of 10. When the tunnel is turned on, the pressure difference between the i
The object of this project is to develop the preliminary design of a bench-top laboratory set-up with which to evaluate the performance of a vapor-compression refrigeration
Carbon dioxide at 20 °C and a pressure of 550 kPa (abs) flows in a pipe at a rate of 0.04 N/s. Determine the maximum diameter allowed if the flow is to be turbulent.
The turbine develops 250 KW of power, which is transmitted to the gears such that C receives 60% and D receives 40%, figure 5. Determine the absolute maximum shear stress in t
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